From Event: SPIE Optical Engineering + Applications, 2017
For paraxial propagation of scalar waves classic electromagnetic theory definitions of transverse linear (TLM) and
orbital angular (OAM) momenta of beam waves are simply related to the wave coherence function. This allows the
extension of the TLM and OAM density concepts to the case of partially coherent waves. This is also makes possible to
use the parabolic equations technique to describe TLM and OAM evolution on propagation. We show that both total
TLM and OAM are conserved for the free space propagation, but not for propagation in inhomogeneous medium in
general. Under Markov Approximation (MA), in the presence of the random statistically homogeneous medium the total
TLM and OAM are conserved in average. Based on the MA parabolic equation for the fourth-order coherence function,
we examine for evolution of the total OAM variance. Perturbation solution of this equation shows that the OAM
fluctuations in general grow approximately linearly with the propagation path length. However, this growth appears to
be slower for the beams with rotation-symmetric irradiance.
Mikhail Charnotskii, "OAM of beam waves in random inhomogeneous medium," Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 104080K (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 31 August 2017); https://doi.org/10.1117/12.2273451.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.